CFD-PBM Approach with Different Inlet Locations for the Gas-Liquid Flow in a Laboratory-Scale Bubble Column with Activated Sludge/Water

Wang, Le; Pan, Qiang; Chen, Jie; Yang, Shuai

doi:10.3390/computation5030038

Cited by 5 publications

(2 citation statements)

References 41 publications

(41 reference statements)

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“…This is attributed to the lower bubble sizes in the low viscosity zones due to reduced coalescence. Wang et al [61] also reported this observation.…”

Section: Resultsmentioning

confidence: 59%

“…Anastasiou et al [4] determined the effective liquid viscosity as a function of the gas flow rate from the mean shear rate. The dynamics related to the bubble rise in CMC and xanthan gum solutions were investigated by Islam et al [60] The hydrodynamics of opaque non-Newtonian liquids in bubble columns was examined by Wang et al [61] Xipeng et al [62] investigated the instantaneous and time-averaged flow fields and velocity distributions in Newtonian and non-Newtonian systems.…”

Section: Introductionmentioning

confidence: 99%

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Bubble size distribution and gas holdup in bubble columns employing non‐Newtonian liquids: A CFD study

Paul

Pakzad

2022

Can J Chem Eng

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The hydrodynamics involved with the rise of air bubbles in shear‐thinning non‐Newtonian liquids in bubble columns was investigated using computational fluid dynamics (CFD). In bubble columns, the bubble size distribution (BSD) and gas holdup significantly affect the mass transfer rates and the reactor design. Consequently, the influence of superficial gas velocity, flow index, consistency index, sparger bubble size, and yield stress were analyzed on a local and global scale. The bubble sizes and the coalescence and breakage phenomena were incorporated using the homogeneous discrete method of the population balance model (PBM). The bubbles underwent coalescence during ascent and exhibited bimodal distribution. The radial homogeneity of the gas phase increased axially. Moreover, the zones of low liquid dynamic viscosity produced zones of a high gas holdup. Though the dual effect of viscosity on gas holdup was non‐existent, the gas holdup surged after 35.1 mPa s at the mid‐zone and remained constant thereafter. The noteworthy differences in simulation results put further emphasis upon the importance of sparger bubble size in CFD modelling. A decrease in the overall gas holdup and the axial air velocity with yield stress was observed. CFD simulation proved capable of providing results in reasonable agreement with experiments.

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“…This is attributed to the lower bubble sizes in the low viscosity zones due to reduced coalescence. Wang et al [61] also reported this observation.…”

Section: Resultsmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Bubble size distribution and gas holdup in bubble columns employing non‐Newtonian liquids: A CFD study

Paul

Pakzad

2022

Can J Chem Eng

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Numerical Simulation of Gas-Liquid-Solid Three Phase in Bubble Column

Wang

Cao

Cai³

et al. 2021

J. Phys.: Conf. Ser.

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Based on the Euler-Euler-Lagrangian framework, the Euler-Euler two-fluid model coupled with population balance model (PBM) and the Discrete Phase Model (DPM) model were used to simulate the gas-liquid-solid three phase dynamic behavior in the laboratory bubble column. The non-Newtonian properties of the liquid phase was considered in the numerical simulation, and the cases with different numerical models were discussed. It is found that the peak value velocity of liquid phase decrease due to the solid phase. The gas holdup remains almost the same in different cases with or without solid phase. There is no obvious periodic oscillation plume in non-Newtonian fluid. The interaction between solid and liquid has an effect on the flow field, gas distribution and viscosity distribution. The flow field calculated by CFD+PBM+DPM model forms three obvious vortices, while the symmetrical vortex is formed by CFD+PBM+DPM model, which is located on both sides of the bubble column. The distribution of dynamic viscosity simulated by different numerical models is basically the same in vary cases.

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CFD-PBM simulation of power law fluid in a bubble column reactor

Duan,

Li,

Bhusal

et al. 2024

International Journal of Chemical Reactor Engineering

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A computational fluid dynamics coupled population balance model (CFD-PBM) was used to numerically simulate the fluid dynamics of bubble swarms in a bubble column containing non-Newtonian fluids. The effects of superficial gas velocity (U g ), the consistency index (K), and the flow index (n) on bubble size distribution (BSD), gas holdup, and fluid dynamic viscosity in a bubble column were analyzed at both local and overall scales. As U g increases, the bubble breakup occurs excessively, the gas holdup increases, and the dynamic viscosity decreases. K and n were used to characterize the rheological properties of power law fluid. As K increases, fluid viscosity increases, bubble breakup rate decreases, gas holdup in the top zone is slightly lower than in the middle zone, and dynamic viscosity increases. Within the range of n from 0.45 to 1.07, when n is smallest, the relative frequency of bubbles smaller than the initial size is relatively large, and the overall and local gas holdup are the highest. When n = 1.07, the fluid exhibits shear-thickening properties, and the dynamic viscosity variations are significant.

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CFD-PBM Approach with Different Inlet Locations for the Gas-Liquid Flow in a Laboratory-Scale Bubble Column with Activated Sludge/Water

Cited by 5 publications

References 41 publications

Bubble size distribution and gas holdup in bubble columns employing non‐Newtonian liquids: A CFD study

Bubble size distribution and gas holdup in bubble columns employing non‐Newtonian liquids: A CFD study

Numerical Simulation of Gas-Liquid-Solid Three Phase in Bubble Column

CFD-PBM simulation of power law fluid in a bubble column reactor

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